KR20190028875A - Display Device - Google Patents

Abstract

According to the present invention, a display device comprises: a display panel displaying an image; a cover unit on the lower part of the display panel; and first and second adhesive members stacked between the display panel and the cover unit. A contact angle of the first adhesive member is greater than that of the second adhesive member, and the contact angle of the first adhesive member is 80 to 90 degrees. The display panel and the cover unit can be easily separated when an adhesion defect occurs as the adhesive force of the first adhesive member is lowered at a temperature of 90°C or higher, since the melting point of the first adhesive member is 90-100°C. Additionally, the display panel includes an adhesive reinforcing layer being in contact with the first adhesive member, and the adhesive reinforcing layer has a plurality of concave patterns corresponding to the first adhesive member such that the adhesive force with the first adhesive member can be improved.

Description

[0001]

The present invention relates to a display apparatus, and more particularly to a display apparatus having a narrow bezel.

In view of the information age, the display field has also been rapidly developed. As a flat panel display device (FPD) having the advantages of thinning, light weight, and low power consumption in response to the information age, ) And an electroluminescent display device (ELD) have been developed and widely used.

Such a flat panel display device is widely used in a portable device such as a smartphone, a monitor of a computer, or a television. The display panel of each flat panel display device is modularized, manufactured, and supplied through various devices such as a case or a cover .

At this time, the display panel of the flat panel display has a display area for displaying an image and a non-display area surrounding the display area, and a case or a cover located on the front surface of the display panel covers the non-display area. Here, the case or the cover portion covering the non-display region is a bezel region of the product.

This bezel area is an area where no image is displayed, which increases the size of the product and deteriorates the appearance of the product.

Therefore, in recent years, by omitting or minimizing a mechanism such as a case, it is possible to reduce the thickness and weight and reduce the bezel area, maximize the size of the display area in the same size display device, borderless products are being researched and developed.

To this end, a structure is proposed in which an adhesive member is applied between a display panel and an instrument supporting the display panel, and the adhesive member fixes the display panel on the instrument by a strong adhesive force.

However, if adhesion failure occurs, the display panel and the structure must be separated from each other, and separate equipment is required for separation, which increases the cost. Further, due to the strong adhesive force of the adhesive member, it is not easy to separate the display panel and the instrument, and the residue of the adhesive agent remains on the separated display panel and the instrument. Accordingly, there arises a problem that the display panel is damaged during the process of removing the residue. Therefore, the display device in which the adhesion failure occurs can not be recycled, which lowers the productivity and increases the cost.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to solve a problem of a decrease in productivity and an increase in cost due to adhesion failure of a display device.

In order to achieve the above object, a display device of the present invention includes a display panel for displaying an image, a cover unit under the display panel, and first and second adhesive members stacked between the display panel and the cover unit , The contact angle of the first adhesive member is larger than that of the second adhesive member, and the contact angle of the first adhesive member is 80 to 90 degrees.

The melting point of the first adhesive member is 90 degrees centigrade to 100 degrees centigrade, and the first adhesive member includes at least one of a non-reactive silicon-based substance and a non-reactive hydrocarbon-based substance.

The first adhesive member is positioned between the display panel and the second adhesive member and the display panel includes an adhesive reinforcing layer in contact with the first adhesive member and the adhesive reinforcing layer has a plurality of concave patterns corresponding to the first adhesive member .

In the present invention, the weight and thickness of the display device can be reduced by fixing the display panel to the structure using the adhesive member.

In addition, the bezel area can be reduced and the borderless structure can be realized, thereby making it possible to differentiate the design.

Further, in the present invention, when the adhesion failure occurs, the display panel can be easily separated from the structure without damaging it, so that the productivity and the cost can be improved by recycling the display panel and the structure.

1 is an exploded perspective view schematically showing a display device according to an embodiment of the present invention.
2 is a cross-sectional view schematically showing a display device according to an embodiment of the present invention.
3A and 3B are schematic cross-sectional views illustrating an example of a display panel of a display device according to an embodiment of the present invention.
4A to 4G are cross-sectional views schematically showing a manufacturing process of a display device according to an embodiment of the present invention.
5 is a cross-sectional view schematically showing a display device according to another embodiment of the present invention.

A display device according to an embodiment of the present invention includes a display panel for displaying an image, a cover unit under the display panel, and first and second adhesive members stacked between the display panel and the cover unit, The contact angle of the first adhesive member is larger than that of the second adhesive member.

The contact angle of the first adhesive member is 80 to 90 degrees.

The melting point of the first adhesive member is 90 to 100 degrees centigrade.

The first adhesive member includes at least one of a non-reactive silicon-based material and a non-reactive hydrocarbon-based material.

Wherein the first adhesive member is positioned between the display panel and the second adhesive member, and the display panel includes an adhesive reinforcing layer contacting the first adhesive member, the adhesive reinforcing layer corresponding to the first adhesive member And has a plurality of concave patterns.

The display panel is an electroluminescence display panel, and the adhesion enhancing layer is an encapsulation layer.

Alternatively, the display panel is a liquid crystal display panel, and the adhesion enhancing layer is a polarizing plate.

Further, the display device of the present invention further includes a third adhesive member between the display panel and the cover unit, the contact angle of the third adhesive member is larger than that of the second adhesive member, 1 and the third adhesive member.

The third adhesive member is positioned between the second adhesive member and the cover unit, and the cover unit has irregularities on the surface in contact with the third adhesive member.

Hereinafter, a display device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an exploded perspective view schematically showing a display device according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view schematically showing a display device according to an embodiment of the present invention.

1 and 2, a display device according to an embodiment of the present invention includes a display panel 110, a cover unit 130 under the display panel 110, a display panel 110, and a cover unit A first adhesive member 120 between the first adhesive member 120 and the cover unit 130 and a second adhesive member 140 between the first adhesive member 120 and the cover unit 130. [

The display panel 110 includes a plurality of pixels, and displays an image through a front surface. The display panel 110 includes an adhesive reinforcing layer 112 at the lowermost portion on the rear surface side.

For example, the display panel 110 may be an electroluminescent display panel including a light emitting diode or a liquid crystal display panel including a liquid crystal capacitor, but the present invention is not limited thereto.

Such a display panel 110 will be described in more detail with reference to FIGS. 3A and 3B. 3A and 3B are schematic cross-sectional views showing an example of a display panel of a display device according to an embodiment of the present invention, and show one pixel region.

First, as shown in FIG. 3A, the display panel 110 of the present invention may be an electroluminescent display panel.

That is, the display panel 110 includes a substrate 150, a thin film transistor Tr disposed on the substrate 150, a light emitting diode D connected to the thin film transistor Tr, D of the encapsulation film 190.

In more detail, a semiconductor layer 154 is formed on the substrate 150. The substrate 150 may be made of glass or plastic, and may have flexibility. A buffer layer (not shown) may be formed between the substrate 150 and the semiconductor layer 154, and the buffer layer may be formed of an inorganic insulating material such as silicon oxide or silicon nitride.

Meanwhile, the semiconductor layer 154 may be formed of an oxide semiconductor material or polycrystalline silicon.

When the semiconductor layer 154 is made of an oxide semiconductor material, a light shielding pattern (not shown) may be formed under the semiconductor layer 154, and the light shielding pattern may prevent light from being incident on the semiconductor layer 154 Thereby preventing the semiconductor layer 154 from being deteriorated by light. Alternatively, the semiconductor layer 154 may be made of polycrystalline silicon. In this case, impurities may be doped on both edges of the semiconductor layer 154.

A gate insulating layer 156 made of an insulating material is formed on the semiconductor layer 154. The gate insulating layer 156 may be formed of an inorganic insulating material such as silicon oxide or silicon nitride.

A gate electrode 160 made of a conductive material such as metal is formed on the gate insulating layer 156 to correspond to the center of the semiconductor layer 154.

3A, the gate insulating layer 156 is formed on the entire surface of the substrate 150, but the gate insulating layer 156 may be patterned to have the same shape as the gate electrode 160.

An interlayer insulating layer 162 made of an insulating material is formed on the gate electrode 160. The interlayer insulating film 162 may be formed of an inorganic insulating material such as silicon oxide or silicon nitride, or an organic insulating material such as benzocyclobutene or photo-acryl.

The interlayer insulating layer 162 has first and second contact holes 164 and 166 that expose both sides of the semiconductor layer 154. The first and second contact holes 164 and 166 are spaced apart from the gate electrode 160 on both sides of the gate electrode 160.

Here, the first and second contact holes 164 and 166 are also formed in the gate insulating film 166. Alternatively, when the gate insulating film 166 is patterned in the same shape as the gate electrode 160, the first and second contact holes 164 and 166 may be formed only in the interlayer insulating film 162.

A source electrode 170 and a drain electrode 172 made of a conductive material such as a metal are formed on the interlayer insulating layer 162.

The source electrode 170 and the drain electrode 172 are spaced apart from each other around the gate electrode 160 and are connected to both sides of the semiconductor layer 154 through the first and second contact holes 164 and 166, / RTI >

The semiconductor layer 154 and the gate electrode 160, the source electrode 170 and the drain electrode 172 constitute the thin film transistor Tr, and the thin film transistor Tr includes a driving element ).

The thin film transistor Tr has a coplanar structure in which the gate electrode 160, the source electrode 170, and the drain electrode 172 are positioned above the semiconductor layer 154.

Alternatively, the thin film transistor Tr may have an inverted staggered structure in which a gate electrode is positioned below the semiconductor layer and a source electrode and a drain electrode are located above the semiconductor layer. In this case, the semiconductor layer may be made of amorphous silicon.

Although not shown, a gate line and a data line cross each other to define a pixel region, and a switching element connected to the gate line and the data line is further formed. The switching element is connected to the thin film transistor Tr which is a driving element.

In addition, a storage capacitor is formed so that the power wiring is spaced apart in parallel to the gate wiring or the data wiring, and the voltage of the gate electrode of the thin film transistor (Tr), which is a driving element during one frame, Lt; / RTI >

A protective layer 174 having a drain contact hole 176 exposing the drain electrode 172 of the thin film transistor Tr is formed to cover the thin film transistor Tr.

A first electrode 180 connected to the drain electrode 172 of the thin film transistor Tr through the drain contact hole 176 is formed on the passivation layer 174 for each pixel region. The first electrode 180 may be an anode and may be formed of a conductive material having a relatively large work function value. For example, the first electrode 170 may be made of a transparent conductive material such as indium-tin-oxide (ITO) or indium-zinc-oxide (IZO) .

A bank layer 186 covering the edge of the first electrode 180 is formed on the passivation layer 174. The bank layer 186 exposes the center of the first electrode 180 corresponding to the pixel region.

A light emitting layer 182 is formed on the first electrode 180. The light emitting layer 182 may be a single layer structure of a light emitting material layer made of a light emitting material. Alternatively, the light emitting layer 182 may have a multilayer structure. For example, the light emitting layer 182 may include a hole injection layer, a hole injection layer, and a hole injection layer sequentially stacked on the first electrode 180. a transporting layer, a light emitting material layer, an electron transporting layer, and an electron injection layer. Here, the light emitting material of the light emitting material layer may be an organic light emitting material or an inorganic light emitting material such as a quantum dot.

A second electrode 184 is formed on the substrate 150 on which the light emitting layer 182 is formed. The second electrode 184 is disposed on the entire surface of the display region and is made of a conductive material having a relatively small work function value and can be used as a cathode. For example, the second electrode 184 may be formed of any one of aluminum (Al), magnesium (Mg), and aluminum-magnesium alloy (AlMg).

The first electrode 180, the light emitting layer 182, and the second electrode 184 form a light emitting diode (D).

An insulating layer 188 is formed on the second electrode 184. The insulating film 188 protects the light emitting diode D and can have a flat surface. This insulating film 188 may be omitted.

An encapsulation layer 112 is formed on the insulating layer 188 to prevent external moisture from penetrating the light emitting diode D. The encapsulation layer 112 may have a single layer of organic and / or inorganic materials or a multi-layer structure of organic and inorganic materials.

Alternatively, the encapsulation layer 112 may be formed of a metal material. For example, the encapsulation layer 112 may be an invar (Fe-36Ni) alloy or a platinum (Fe-42Ni) alloy containing nickel (Ni) (Fe-Ni-Co) alloy including nickel and cobalt (Co), but is not limited thereto.

This encapsulation layer 112 corresponds to the adhesion enhancement layer of the present invention. That is, the display panel 110 of the present invention is configured such that the encapsulation layer 112 is disposed to face the cover unit 130, the substrate 150 is disposed on the front side of the display panel 110, May be emitted through the substrate 150 to the outside. The display panel 110 of the present invention may be a bottom emission type.

However, the present invention is not limited thereto. The display panel 110 of the present invention may be a top emission type in which light from the light emitting diode D is emitted to the outside through the encapsulation layer 112. At this time, the display panel 110 may further include a separate adhesive reinforcing layer under the substrate 150.

Meanwhile, as shown in FIG. 3B, the display panel 110 of the present invention may be a liquid crystal display panel.

That is, the display panel 110 includes first and second substrates 210 and 250 facing each other, and a liquid crystal layer 262 interposed between the first and second substrates 210 and 250, Layer 260 and the first and second polarizers 112 and 274 may be disposed on the outer surfaces of the first and second substrates 210 and 250, respectively.

The first substrate 210 may be made of glass or plastic, and may have flexibility. In addition, a buffer layer (not shown) may be further formed on the first substrate 210.

A gate electrode 222 is formed on the first substrate 210 and a gate insulating film 224 is formed to cover the gate electrode 222. A gate wiring (not shown) connected to the gate electrode 222 is formed on the first substrate 110.

A semiconductor layer 226 is formed on the gate insulating layer 224 in correspondence with the gate electrode 222. The semiconductor layer 226 may be made of an oxide semiconductor material. Meanwhile, the semiconductor layer 226 may include an active layer made of amorphous silicon and an ohmic contact layer made of impurity amorphous silicon.

A source electrode 230 and a drain electrode 232 are formed on the semiconductor layer 226. In addition, a data line (not shown) connected to the source electrode 230 intersects the gate line to define a pixel region.

The gate electrode 222, the semiconductor layer 226, the source electrode 230, and the drain electrode 232 constitute a thin film transistor Tr.

A protective layer 234 having a drain contact hole 236 exposing the drain electrode 232 is formed on the thin film transistor Tr.

A pixel electrode 240 connected to the drain electrode 232 through the drain contact hole 236 and a common electrode 242 alternately arranged with the pixel electrode 240 are formed on the passivation layer 234, .

The common electrode 242 is arranged on the first substrate 210 in an alternating manner with the pixel electrode 240. Alternatively, the common electrode 242 may be disposed on the entire surface of the second substrate 250 And the pixel electrode 240 may be formed in a plate shape in the pixel region.

The second substrate 250 is spaced apart from the first substrate 210. The second substrate 250 may be made of glass or plastic, and may have flexibility.

On the inner surface of the second substrate 250, a black matrix 254 covering the non-display regions such as the thin film transistor Tr, the gate line, and the data line is formed. Further, a color filter layer 256 is formed corresponding to the pixel region. A buffer layer (not shown) may be further formed between the second substrate 250 and the color filter layer 256.

The first and second substrates 210 and 250 are bonded together with the liquid crystal layer 260 interposed therebetween and the liquid crystal layer 260 is formed by an electric field generated between the pixel electrode 240 and the common electrode 242. [ Of the liquid crystal molecules 262 are driven. The pixel electrode 240, the common electrode 242, and the liquid crystal layer 260 form a liquid crystal capacitor, and the liquid crystal capacitor is connected to the thin film transistor Tr.

Although not shown, an alignment layer may be formed on each of the first and second substrates 210 and 250 in contact with the liquid crystal layer 260.

On the other hand, first and second polarizers 112 and 274, which transmit only linearly polarized light in specific directions, are attached to the outer surfaces of the first and second substrates 210 and 250, respectively. Polarizing plate 274 and the light-transmitting axis of the polarizing plate 274.

Here, the first polarizing plate 112 corresponds to the adhesive strengthening layer of the present invention. That is, the display panel 110 of the present invention is disposed such that the first polarizing plate 112 faces the cover unit 130, and light passing through the display panel 110 is emitted to the outside through the second polarizing plate 274. [ .

Referring again to FIGS. 1 and 2, the adhesive strength layer 112 of the display panel 110 may have a concave pattern 112a with an edge pattern. The concave pattern 112a increases the area of adhesion with the first adhesive member 120 and improves the adhesion. The concave pattern 112a may be omitted.

Here, the width w1 of the concave pattern 112a corresponds to the width of the first adhesive member 120. In one example, the width w1 of the concave pattern 112a may be 0.4 mm to 3 mm, but is not limited thereto.

In addition, the length d1 and the spacing s1 of the concave pattern 112a may be 2 mm to 3 mm, respectively, but are not limited thereto.

The cover unit 130 is located on the back side of the display panel 110, that is, below the display panel 110. The cover unit 130 supports and protects the display panel 110. The cover unit 130 may include a horizontal portion in the form of a flat plate corresponding to the back surface of the display panel 110. The cover unit 130 may further include a vertical portion that surrounds the side surface of the display panel 110 or that is located under the edge of the display panel 110 and is connected to the horizontal portion. Alternatively, the cover unit 130 may have a rectangular frame shape corresponding to the first and second adhesive members 120 and 140, but is not limited thereto.

When the display panel 110 is an electroluminescent display panel, the cover unit 130 may be a back cover. Alternatively, when the display panel 110 is a liquid crystal display panel, the cover unit 130 may be a bottom cover, and a backlight unit (not shown) may be used as a light source between the display panel 110 and the butter cover. Can be located.

The cover unit 130 may be made of a metal material having a relatively high stiffness, but is not limited thereto. For example, the cover unit 130 may be made of electrolytic galvanized iron (EGI) containing iron (Fe) as a main component.

Alternatively, the cover unit 130 may be a middle frame between the back cover and the display panel 110, or between the bottom cover and the display panel 110.

Although not shown, a driving unit, a heat radiating member, and / or an auxiliary plate may be further disposed between the display panel 110 and the cover unit 130.

The driving unit is connected to at least one side of the display panel 110 to apply various signals to the display panel 110. The driving unit may include a printed circuit board (PCB) and at least one integrated circuit (IC) on a printed circuit board. The integrated circuit may be, but is not limited to, a timing controller (T-Con) or a power IC. The driving unit may further include a resistor, a capacitor, or a transistor on the printed circuit board.

The driving unit is connected to the display panel 110 through an intermediate means and is placed on the rear surface of the display panel 110 in the modularization process. At this time, the printed circuit board is positioned between the display panel 110 and the integrated circuit. Here, the intermediate means may be a flexible printed circuit (FPC), a tape or a film, but is not limited thereto.

The heat dissipating member is in contact with the integrated circuit of the driving unit or the display panel 110 to quickly transfer heat generated from the integrated circuit of the driving unit or the display panel 110 to the outside, thereby preventing the device from being deteriorated by heat.

Further, the auxiliary plate increases the rigidity of the display device to prevent the occurrence of warpage. That is, in the case of a display device having a large screen size, warping of the display device may occur. By adding an auxiliary plate to increase the rigidity of the display device, it is possible to prevent the display device from warping.

As described above, the first and second adhesive members 120 and 140 are positioned between the display panel 110 and the cover unit 130, and the first and second adhesive members 120 and 140 It has a square tee shape. The first and second adhesive members 120 and 140 may have the same width. At this time, the first adhesive member 120 is in contact with the front panel 110, and the second adhesive member 140 is in contact with the cover unit 130. Therefore, the second adhesive member 140 is positioned between the first adhesive member 120 and the cover unit 130.

Here, the first adhesive member 120 has a melting point of 90 to 100 degrees Celsius. As a result, the first adhesive member 120 is easily delaminated because the adhesive force is lowered at a temperature of 90 degrees Celsius or more. For example, at room temperature, the dynamic shear strength of the first adhesive member 120 is about 9.21 kgf / cm ² , and the dynamic shear strength of the first adhesive member 120 at about 80 degrees Celsius is about 7.73 kgf / in contrast to ² cm it is reduced about 16% have a greater adhesive strength decreases, it is a dynamic shear strength is lowered about 93% to about 0.67 kgf / cm ² separation of the first adhesive member 120 easily at 100 degrees Celsius.

It is preferable that the first adhesive member 120 completely covers the surface of the adhesive reinforcing layer 112 of the display panel 110. Here, when the adhesion enhancing layer 112 has the concave pattern 112a, one surface of the first adhesion member 120 that contacts the adhesion enhancing layer 112 has a convex pattern corresponding to the concave pattern 112a. At this time, the difference between the maximum thickness of the first adhesive member 120 and the thickness of the adhesive reinforcing layer 112 is preferably about 10 micrometers to 100 micrometers.

Alternatively, when the adhesion enhancing layer 112 does not have the concave pattern 112a, one surface of the first adhesion member 120 in contact with the adhesion enhancing layer 112 is flat, and the first adhesion member 120 ) Is preferably about 10 micrometers to 100 micrometers.

The first adhesive member 120 preferably has hydrophobicity. On the other hand, the second adhesive member 140 preferably has hydrophilicity. At this time, the surface energy of the first adhesive member 120 is lower than that of the second adhesive member 140, and the contact angle of the first adhesive member 120 is larger than that of the second adhesive member 140. In one example, the contact angle of the first adhesive member 120 is preferably 80 to 90 degrees. When the contact angle of the first adhesive member 120 is less than 80 degrees, it is difficult to separate the display panel 110 from the cover unit 130 at the time of poor adhesion because the adhesive property is excellent but the peelability is low. On the other hand, when the contact angle of the first adhesive member 120 is larger than 90 degrees, the peelability is good but the adhesion is low, so that the adhesion failure may occur.

The first adhesive member 120 is made of a composition including a base resin and an additive. At this time, the content of the additive is preferably about 1 wt% to 3 wt% based on the base resin, but is not limited thereto. The base resin may be, but is not limited to, an epoxy resin. As the additives, a non-reactive silicone material or a non-reactive hydrocarbon material alone or a mixture thereof may be used in the modified silicone. For example, polysiloxane having a functional group such as alkyl or aryl may be used as the non-reactive silicone material, and polyethylene (PE) or polypropylene modified waxes such as polypropylene (PP) and carnaubar (modified wax) may be used.

On the other hand, the second adhesive member 140 may be an elastic adhesive having a relatively low modulus and high adhesion. The elastic adhesive may include an acrylic material, a urethane material, or a mixture thereof. The contact angle of the second adhesive member 140 may be 60 to 70 degrees, but is not limited thereto.

Alternatively, the second adhesive member 140 may be a foam pad or a double-sided tape including an adhesive layer on both sides of the base substrate and the base substrate. The pressure-sensitive adhesive layer of the foam pad or the double-sided tape may be made of an acrylic material, and the contact angle of the pressure-sensitive adhesive layer may be 60 to 70 degrees. In addition, the base substrate of the foam pad is made of a material having elasticity. For example, the base substrate of the foam pad may be made of polyethylene, polyacryl, or polyurethane, It does not. Meanwhile, the base substrate of the double-sided tape may be made of polyethylene terephthalate (PET), but is not limited thereto.

As described above, in the display device according to the embodiment of the present invention, the display panel 110 is fixed to the cover unit 130 by using the first and second adhesive members 120 and 140, And the bezel area can be reduced.

At this time, by using the fact that the adhesive force of the first adhesive member 120 is lowered at a specific temperature section, separation of the display panel 110 and the cover unit 130 can be facilitated when adhesion failure occurs.

Further, by forming the concave pattern 112 on the adhesive strengthening layer 112 of the display panel 110 in contact with the first adhesive member 120, the adhesive force between the first adhesive member 9120 and the display panel 110 can be improved .

Hereinafter, a manufacturing process of a display device according to an embodiment of the present invention will be described with reference to the drawings.

4A to 4G are cross-sectional views schematically showing a manufacturing process of a display device according to an embodiment of the present invention.

First, as shown in FIG. 4A, a display panel 110 having an adhesive strengthening layer 112 is prepared on one surface, and the adhesive strength layer 112 is patterned to form a concave pattern 112a at the edge.

When the display panel 110 is an electroluminescent display panel, the adhesive reinforcing layer 112 may be an encapsulation layer. Alternatively, when the display panel 110 is a liquid crystal display panel, the adhesion enhancing layer 112 may be a lower polarizer plate.

Next, as shown in Fig. 4B, a first adhesive member 120a is formed on the adhesive strengthening layer 112. Then, as shown in Fig. The first adhesive member 120a may be formed by applying a solution containing a base resin, an additive and an organic solvent, followed by curing. At this time, the first adhesive member 120a can be cured at room temperature, but is not limited thereto.

Next, as shown in Fig. 4C, a cover unit 130 is prepared, and a second adhesive member 140a is formed on one surface of the cover unit 130. Next, as shown in Fig.

Here, when the second adhesive member 140a is an elastic adhesive, the second adhesive member 140a may be formed by first curing the adhesive composition after application. At this time, the second adhesive member 140a may be first cured using UV, but is not limited thereto.

Next, as shown in Fig. 4D, the display panel 110 and the cover unit 130 are disposed so that the first adhesive member 120a and the second adhesive member 140a face each other, and the first adhesive member 120a And the second adhesive member 140a. Next, the second adhesive member 140a is secondarily cured to fix the display panel 110 and the cover unit 130 by bonding the first adhesive member 120a and the second adhesive member 140a. At this time, the second adhesive member 140a can be secondarily cured through moisture curing, but is not limited thereto.

However, adhesion failure may occur in the process of bonding the display panel 110 and the cover unit 130 through the first and second adhesive members 120a and 140a.

Thus, as shown in FIG. 4D, the first adhesive member 120a is separated from the display panel 110 by applying heat of 90 degrees Celsius or more to weaken the adhesive force of the first adhesive member 120a. At this time, the first adhesive member 120a can be kept adhered to the second adhesive member 140a by the adhesive force of the second adhesive member 140a.

Next, as shown in Fig. 4F, the second adhesive member 140a adhered to the cover unit 130 is separated from the cover unit 130 together with the first adhesive member 120a. At this time, since the first and second adhesive members 120a and 140a are bonded only to the cover unit 130, they can be separated from the cover unit 130 more easily.

Since the display panel 110 and the cover unit 130 are separated from each other without any damage and no residue remains on the separated display panel 110 and the cover unit 130, Can be recycled.

Next, as shown in FIG. 4G, the display panel 110 and the cover unit 120 are fixed again through the first and second adhesive members 120 and 140 by performing the steps of FIGS. 4B to 4D, Complete the device.

As described above, in the present invention, the display panel 110 and the cover unit 130 can be easily separated from each other without damage when an adhesive failure occurs. Accordingly, the display panel 110 and the cover unit 130 can be recycled to increase the productivity and reduce the cost.

5 is a cross-sectional view schematically showing a display device according to another embodiment of the present invention. The structure except for the third adhesive member is the same as the previous embodiment, and the same reference numerals are assigned to the same parts, Or briefly.

5, a display device according to another embodiment of the present invention includes a display panel 110, a cover unit 130, a display panel 110, and a cover unit 130, which are disposed under the display panel 110, Second, and third adhesive members 120, 140, 122 between the first, second, and third adhesive members 120, 140, 122.

Here, the first adhesive member 120 is in contact with the display panel 110, the third adhesive member 122 is in contact with the cover unit 130, and the second adhesive member 140 is in contact with the first and third adhesive members 120, Is located between the members (120, 122).

The first and third adhesive members 120 and 122 have a melting point of 90 to 100 degrees Celsius, and are easily peeled off at a temperature of 90 degrees Celsius or less. It is preferable that the first and third adhesive members 120 and 122 have hydrophobicity. On the other hand, the second adhesive member 140 preferably has hydrophilicity. The surface energy of the first and third adhesive members 120 and 122 is lower than that of the second adhesive member 140 and the contact angle of the first and third adhesive members 120 and 122 is lower than that of the second adhesive member 140 ). In one example, the contact angle of the first and third adhesive members 120 is preferably 80 to 90 degrees.

On the other hand, the adhesive strength layer 112 of the display panel 110 in contact with the first adhesive member 120 may have a concave pattern 112a with an edge pattern. The concave pattern 112a increases the area of adhesion with the first adhesive member 120 and improves the adhesion. The concave pattern 112a may be omitted.

In addition, the surface of the cover unit 130 that contacts the third adhesive member 122 may have irregularities by plasma treatment. This unevenness increases the adhesion area with the third adhesive member 122 and improves the adhesive strength.

As described above, the display device according to another embodiment of the present invention is configured to adhere the first and third adhesive members 120 and 122, which have lowered adhesive strength, to the display panel 110 and the cover unit 130, It is possible to facilitate separation of the display panel 110 and the cover unit 130 when adhesion failure occurs.

In the display device according to another embodiment of the present invention, the first adhesive member 120 may be omitted.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It can be understood that

110: Display panel 112: Adhesion strengthening layer
112a: concave pattern 120, 120a: first bonding member
130: cover unit 140, 140a: second adhesive member
122: third adhesive member

Claims (9)

A display panel for displaying an image;
A cover unit under the display panel;
The first and second adhesive members stacked between the display panel and the cover unit
Lt; / RTI >
Wherein a contact angle of the first adhesive member is larger than that of the second adhesive member.
The method according to claim 1,
Wherein a contact angle of the first adhesive member is 80 to 90 degrees.
3. The method of claim 2,
Wherein the melting point of the first adhesive member is 90 to 100 degrees centigrade.
The method of claim 3,
Wherein the first adhesive member comprises at least one of a non-reactive silicon-based material and a non-reactive hydrocarbon-based material.
The method according to claim 1,
Wherein the first adhesive member is positioned between the display panel and the second adhesive member, and the display panel includes an adhesive reinforcing layer contacting the first adhesive member, the adhesive reinforcing layer corresponding to the first adhesive member And has a plurality of concave patterns.
6. The method of claim 5,
Wherein the display panel is an electroluminescent display panel, and the adhesive reinforcing layer is an encapsulation layer.
6. The method of claim 5,
Wherein the display panel is a liquid crystal display panel and the adhesive reinforcing layer is a polarizing plate.
8. The method according to any one of claims 1 to 7,
The display device according to claim 1, further comprising a third adhesive member between the display panel and the cover unit, wherein a contact angle of the third adhesive member is larger than that of the second adhesive member and the second adhesive member is provided between the first and third adhesive members The display being located.
9. The method of claim 8,
Wherein the third adhesive member is positioned between the second adhesive member and the cover unit, and the cover unit has a concavo-convex surface on a surface in contact with the third adhesive member.

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